class_docstr: Dictionary subclass whose entries can be accessed like attributes (as well as normally).
  Credits: https://aiida.readthedocs.io/projects/aiida-core/en/latest/_modules/aiida/common/extendeddicts.html#AttributeDict  # noqa
code: def __dir__(self):
      return self.keys()
  
file_path: vissl/vissl/config/attr_dict.py
label_desc: Use image node_id 9 for calling the AttrDict obj's underlying member method code with example usage: obj.__dir__() and returns: self